Помогла статья
http://www.msexchange.org/articles/F...Addresses.html
"1.Run Active Directory Users and Computers.
2.Right-click the domain object and choose Find from the context menu. This will bring up the Find Users, Contacts, and Groups window.
3.In the Find drop-down list, choose Custom Search.
4.Click the Advanced tab and in the Enter LDAP query: field, enter the following text: proxyaddresses=smtp:exchange_2007@neilhobson.com.
5.Click the Find Now button."
